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arXiv · 2606.21941

Computing the Hamiltonian compression factors of cubic graphs

Marston Conder·Gregor Potocnik·Primoz Potocnik
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Abstract

We present an algorithm for computing Hamiltonian cycles that are invariant under a graph automorphism acting on them as a rotation. We also present an application of this algorithm for computing the Hamiltonian compression factor of a graph, that is, the largest order of an automorphism preserving some Hamiltonian cycle and acting on it as a rotation. As an example, we compute the Hamiltonian compression factors of all cubic edge-transitive graphs on up to $10{,}000$ vertices, with the exception of two graphs, which are not Hamiltonian, and $98$ graphs (the smallest having $2304$ vertices) for which only a lower bound for the compression factor is given. As a byproduct, we obtain shortest LCF codes for each of these graphs (except for the two non-Hamiltonian ones; for the $98$ unresolved graphs, the codes obtained are the shortest among those we found).

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Marston Conder, Gregor Potocnik, Primoz Potocnik. 2026-06-20. Computing the Hamiltonian compression factors of cubic graphs. https://arxiv.org/abs/2606.21941

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